straight vane versus ramped
I have nearly identical late 70's Filter Flo's, one with a ramped agitator, the other with the original straight vane. Frankly, I can't tell the difference in performance. Both are great at turnover with any clothing I throw at them. I admit they aren't both together in use to watch exact comparisons, but I am getting fantastic results from the straight vane, so I'll just leave the ramped one sitting un-installed as is until it is time to swap around a few machines in the working lineup. Heavy blue jeans, large blankets, full loads of towels, double bed sheets, everything seems great in either machine.